Figure 7-58. Hue4039A Receiver Front-End Schematic - Motorola ASTRO XTL 1500 Detailed Service Manual

Schematics, Component Location Diagrams, and Parts Lists: HUE4039A (UHF Range 1) Main Board
9.3V_TO_IF
R5303
4.7K
C5287
Q5250
C5284
.01uF
R5301 .01uF
L5283
10K
82nH
R5300
4.7K
C5362
R5302
220pF
1K
L5280
1uH
C5291
TP5301 C5292
.01uF 220pF
RF_IN
HPF to remove VHF
D5280
D5300
C5283 C5285 C5288 C5290
4.7pF 8.2pF 220pF C5293
8.2pF
D5311
L5282 L5284 2pF
L5281 18nH
18nH
NU
390nH
C5282
C5289
220pF
.01uF
RX_FILT_1_A
R5332 R5304
Q5251
1K
1.5K
C5363 C5364
220pF
1000pF
RF_ATTN_1_A
RF_ATTN_2_A
RF_ATTN_3_A
RX_Inj_SW
LO_IN
6815854H01-A
C5294
.01uF
C5301
C5303
.01uF
.01uF
R5310
L5288 1K
82nH
R5305
Q5253
4.7K
L5290
1uH
C5296 C5299
R5308
220pF .01uF
68
R5306
15K
L5286
47nH
L5285
D5302
Preselector Ref Des = 5250 - 5279
68nH
C5295 C5300
C5304
RF_IN_1 RF_OUT_1
3.9pF 220pF 220pF
Q5252
C5297
R5309
FE_CNTL_1
2.7pF
27
L5289
R5307
390nH
22K
R5330
L5287
C5302
47
22nH
.01uF
R5333
47
C5365 C5366
220pF
1000pF
D5313
U5301
C5280
1
3
IN OUT
220pF
GND
C5311 C5315
9.3V_TO_IF 2
.01uF
4.7uF
R5314
R5313 4.7K
4.7K
9.3V_TO_IF R5317
1K
C5313
.01uF
C5309
Q5254
R5312
.01uF
10K
C5316 C5317
R5316
1K 220pF
470pF
L5292
390nH
C5307
AGC/Attenuator circuit
L5291
220pF 1uH
Second LNA
D5304
R5311
10K U5302
C5312
L5308
D5281 3 RFIN 6
RFOUT
15nH
Q5257
220pF
R5335
L5293
0
390nH
NU
C5310
220pF
C5314
U5300
.01uF
C5305
GND
2
R5334 R5315
220pF
Q5255
1.5K
1K
C5308
C5368
C5306 C5367
220pF
NU 1000pF
220pF
220pF
9.3V_TO_IF
C5322
.01uF
C5327
C5318
100pF
4.7uF
L5298
image filter and IF suck-out
22nH
C5319
C5332 C5341
.01uF
3.6pF 3.6pF
Q5256
C5328
C5336 L5301 C5342
L5297 L5300
27nH
27nH 27nH
18pF 9.1pF
9.1pF
C5326 C5331 C5339
12pF 9.1pF 5.6pF
L5299
C5325
.033uF C5335 C5338
R5318
1K
.033uF 220pF
L5296
1uH
L5294
39nH
C5320
C5329
220pF D5305
R5336
100pF C5333
0 470pF
L5295
NU NU R5321
390nH
C5361
C5360
C5321
120
220pF R5319
.033uF
NU
470 TP5302
220pF
C533 0
220pF
NU
Q5258
C5323
C5324
220pF
.033uF
D5306
C5334 C5340
5.6V C5337
NU
220pF .033uF 220pF

Figure 7-58. HUE4039A Receiver Front-End Schematic

7-75
RX switching voltages
RX Receive RX Receive
Test points
700 MHz 800 MHz
TP6254 0V 3V
TP6255, 57, 59, 61 7.7V 4.3V
TP6256, 58, 60, 62 2.3V 7.7V
Mixer Ref Des = 5380 - 5399
TP5303
TP5304
MIXER_RF_IN
IF_OUT_IF
IF
LO
D5307 D5282
NU
C5347
L5304
27nH
18pF
C5344 C5349 SH5250
9.1pF 8.2pF
NU
R5324 R5325 R5326
15 15 15
C5346 C5348
L5303
L5305
C5356
C5357
68nH 15nH
.033uF 220pF
220pF
.033uF
R5322
2.4K
C5345
R5327
180
470pF
TO_1st_MIXER
RFOUT1 6
16 C5354
RFIN L5306
L5307
1 RFOUT2 7
VCNTRL
14 2
VD1 VG1
8.2nH 8.2nH
11 47pF
VG2 3
G2
C5355 C5358
C5343 C5359
8 U5303
NC1
9
22pF NC2 10pF 11pF
C5351 1.5pF
10 C5353
NC3 R5329 NU
15
NC4 .033uF 1K
220pF
NU
L5302
12nH
C5350 C5352 R5328
5.6K
.033uF 220pF
NU
R5323
12K
June 15, 2005